use official rust docker image for multi-arch support

joystream-node.Dockerfile

@@ -1,11 +1,13 @@
-FROM liuchong/rustup:nightly AS rustup
-RUN rustup install nightly-2021-03-24
+FROM rust:1.52.1-buster AS rust
+RUN rustup self update
+RUN rustup install nightly-2021-03-24 --force
 RUN rustup default nightly-2021-03-24
 RUN rustup target add wasm32-unknown-unknown --toolchain nightly-2021-03-24
+RUN rustup component add --toolchain nightly-2021-03-24 clippy
 RUN apt-get update && \
   apt-get install -y curl git gcc xz-utils sudo pkg-config unzip clang llvm libc6-dev
 
-FROM rustup AS builder
+FROM rust AS builder
 LABEL description="Compiles all workspace artifacts"
 WORKDIR /joystream
 COPY . /joystream
@@ -17,7 +19,7 @@ RUN BUILD_DUMMY_WASM_BINARY=1 cargo clippy --release --all -- -D warnings && \
     cargo test --release --all && \
     cargo build --release
 
-FROM debian:buster
+FROM rust:1.52.1-slim-buster
 LABEL description="Joystream node"
 WORKDIR /joystream
 COPY --from=builder /joystream/target/release/joystream-node /joystream/node